var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");        
var isIE=navigator.userAgent.indexOf("IE")>0;
var isIE5=navigator.userAgent.indexOf("IE 5.0")>0;
var isIE6=navigator.userAgent.indexOf("IE 6.0")>0;
var isNav=(navigator.appName.indexOf("Netscape")!=-1);
var element;
function $(obj){
	return typeof(obj) == "string" ? document.getElementById(obj) : obj;
}
String.prototype.trim=function(){
	return this.replace(/(^[\s]*)|([\s]*$)/g, "");
};
function hide(el) {
	element = $(el);
	element.style.display = 'none';
}
function show(el) {
	element = $(el);
	element.style.display = '';
}
function remove(el){
	element = $(el);
	element.parentNode.removeChild(element);
}
function toggle(el) {
    el = $(el);
	if(el.style.display=="none"){
		el.style.display='block';
	}else{
		el.style.display='none';
	}
}


function addListener(element, type, expression, bubbling)
{
  bubbling = bubbling || false;
  if(window.addEventListener)	{ // Standard
    element.addEventListener(type, expression, bubbling);
    return true;
  } else if(window.attachEvent) { // IE
    element.attachEvent('on' + type, expression);
    return true;
  } else return false;
}

function rewrite_url(pname , pid){
	if(pid == null || pid == "undefined" ) {return ""};
	var re = /[^a-zA-Z0-9]/ig;
	var url = "";
	if(FRIENDLY_URLS != null && FRIENDLY_URLS == 'true'){
		url = baseURL + pname.replace(re,"-") + "_p" + pid + ".html";
	}
	else{
		url = linkURL+pid;
	}
	return url;
}

function postAjax(url,content,onComplete){
	var options=new Object();
	options.method="post";
	options.asynchronous=true;
	options.parameters=content;
	options.onComplete=onComplete;
	return new Ajax.Request(url, options);
}

function checkEmail(id){
	var email = $(id) == null ? '' : $(id).value;
	if(!/(\,|^)([\w+._]+@\w+\.(\w+\.){0,3}\w{2,4})/.test(email.replace(/-|\//g,""))){
		$(id).focus();
		alert('Please check your email address.\nYour email addresses should look like "myname@gmail.com"');
		return false;
	}
	else{
		return true;	
	}
}


function back(num){
	history.go(num);
	return false;
}

function close_box(obj){	
	hide(obj.parentNode);
}


function g(o){return document.getElementById(o);}
function HoverLi(n)
{
	for(var i=1;i<=2;i++){g('tb_'+i).className='normaltab';g('tbc_0'+i).className='undis';}
	g('tbc_0'+n).className='dis';g('tb_'+n).className='hovertab';
}